Why we like it: Crafted from 100 percent lambswool, the Fjällräven Byron Hat Thin is a luxe option for cold-weather comfort.

Cotton is great if you run hot but like the look of a beanie, and something lined with fleece or jersey will be extra toasty but runs the risk of giving you gnarly hat hair." Just know that ...

Carhartt’s Knit Cuffed Beanie is a workwear staple. The classic beanie is woven from acrylic yarn that’s lighter and less hot than wool. Plus, it’s available in more than 15 colors.

Running in the winter without proper head protection can lead to heat loss and will make that run a lot less comfortable,” ...